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Abstract
The deflagration of hydrogen in confined spaces is a significant safety concern. To eliminate hydrogen for ensuring safety, we study catalysts for catalytic oxidation of hydrogen at room temperature. Bimetallic PtPd catalyst is prepared on the hydrogen storage alloy ZrVFeTi by the chemical reduction method. The structure, composition, morphology and elemental analyses are characterized using XRD, HR-TEM, XPS and ICP-AES, and its hydrogen elimination performance is also studied. The obtained results show that Pt-Pd/ZrVFeTi bimetallic catalyst displays superior catalytic performance toward H2 oxidation reaction than monometallic Pt/ZrVFeTi or Pd/ZrVFeTi catalyst, which can be attributed to the presence of the PtPd alloyed structures. The Pt-Pd/ZrVFeTi bimetallic catalyst exhibits a high hydrogen conversion of 98.8 % when the hydrogen inlet concentration is 4 vol%, which is higher than 94.3 % for Pd/ZrVFeTi and 91.3 % for Pt/ZrVFeTi. Furthermore, it maintains excellent catalytic activity over 120 mins of the testing experiments, demonstrating remarkable stability. The synergistic effect between Pt and Pd proves beneficial for H2 oxidation reaction.
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